Engine.



Patented May `6, |902.

nu. s99,|4|.

J. IVE/RAUTIGAM &. P-. HOELZLEIN. ENGINE.

(Application led July 8, 1901.) (Nvo Model.)

UNITED STATES PATENT OEEIcE.

JOSEPH BRAUTIGAM AND PHILIPP HOELZLEIN, OF BROOKLYN, NEW YORK.

ENGINE.v

SPECIFICATION formingpart of Letters Patent No. 699,141, dated May 6, 1902. Application liled July 8, 1901. Srerial lilo. 67,399. (No model.)

.To LLZZ whom it may concern;

.Be it known that we, JOSEPH BRAUTIGAM v'and PHILIPP HOELZLEIN, citizens of the United States, and residents of Brooklyn, in the city and State of New York, have invented certain new and useful Improvements in and Pertaining to Engines, of which the following is a specification.

O'ur invention relates to improvements in engines, and more particularly to means and method of operating engines employing a piston that is not subject to operating pressure in every cycle of movement thereof.

It is a common device to admit pressure upon the piston of certain engines at every fourth stroke only or other suitable interval, the weight of the running parts serving in the meanwhile to keep up the motion. This method is more especially adapted to engines that are operated by the expansive force of a gas, the resultant of an explosion brought about in any one of several ways, as the ignition of an explosive solid or explosive admixture of gases. While such engines may be double-acting, the pressurewoperating alternately on opposite sides of a piston, a usual practice is to provide a single-acting cylinder with means for directing the gas resultant from an explosion upon the inner side of said piston to force it outwardly, thus driving the Iiy-wheel, if that contrivance be employed. Suitable mechanism will thereafter cause the explosion contrivances to become inoperative until the required number of strokes have elapsed or until in some cases the speed of the liy-wheel is reduced to a predetermined point, when a new explosion will occur.` There will be an exhaust for the cylinder to provide for the escape therefrom of air or gas on the return-stroke of the piston. It is to an engine of this class that we have shown our invention applied in the drawings.

We will first describe an engine embodying our invention and then point out its novel features in the claims.

Figure l is a side elevation, partly in section, of a device embodying our invention, together with a sufcientvportion of -an engine to clearly illustrate its operation. Fig. 2 is a detached View, on an enlarged scale, of the catch shown in Fig. 1 for carrying out our invention.

w Similar letters of reference designate corresponding parts in the gures of the drawings.

A represents the main shaft of an engine embodying our invention. B represents a fly-wheel thereon.

` C represents the cylinder, preferably open at the end thereof nearest the shaft A.

D represents a valve-chest adjacent the cylinder C.

E represents a connecting-rod connected with apiston within the cylinder C and with a crank e onthe shaft A.

The construction of the valve-chest D is as follows: A main chamber at F connects by a port-f with the interior of cylinder C. An upper chamber at G is connected through pipe G with a gas-supply (not shown) and through an opening at g with the main chamber F. A lower chamber H is connected with pipe H for the purpose of exhausting or allowing escape of compression and through opening at h with the main chamber F. A'chamber I is open to the atmosphere through pipe I and connected'through opening at with the main chamber F. The said chambers F G H I are formed for convenience .in juxtaposition. A cover (not shown)V will be attached to close said chambers from the atmosphere.

J represents a valve-rod with valve at j and passing through chamber G at g for closing lthe port or opening g, and a spring J', bearing upon a collar jon the rod J, normally keeps said port closed. Similarly the port h in chamber Il 'is normally closed through the action of spring K bearing on a collar lc on a valve-rod K,.thevalvelc adapted to close said port h, but shown open. In like manner Lrepresents a valve-rod with valve Z for closing'port inichamber I, spring L acting on collar Z. to keep;k said valvenormally closed.

'The spring L will be of comparatively light tension.v

' AV 'preferable construction .for VV'actuating valve-rod'Jis as follows 0n shaft Ajisvafpinion M, engaging a gear M', hav-ingdouble the number of teeth and which-is -providedwith a cam Nfor actuating the rodJ. f Therefore the .valve-'J can never be operated more than once for every two cycles of piston movement. m represents a xed bracket provided with bearings for a horizontal slide N, that is provided with a roller n for engaging cam N and a spring n' to maintain the two in contact. A vertical arm O upon slide N has pivoted at o a part consisting of a horizontally-extending portion O', forming an arm for actuating rod J, and an upwardly-extending governor device. This latter device comprises aweight P and a screw-threaded adjusting-rod P', having nuts p p and a spring 2J' to cause an upward pressure regulated by means of screw p and tending to force weight P to the left in Fig. I. On valve-rod J is an enlarged portion Q, engaging a bearing-surface on bracket Q', and this portion Q is provided with projection or notch q for engaging with arm O. On gear M is also provided a cam R for engaging a roller R on the part 'r of valve-rod K, which part r is supported in bearings in bracket m. The arrow shows the direction of rotation of pinion M. Gear M consequently rotates in the reverse direction, wherefrom it will be seen that valve-rod K will be operated by its cam after the rod J.

S represents a catch-lever pivoted to bracket Q' and extending horizontally, preferably between the rods J and K, and it is provided with a catch s, adapted to engage a projection or notch r on rod K when valve k is open, so as to hold the same open against the force of spring K. Said catch-lever is also provided with a cam at s' for engaging a roller q upon rod J, the roller eiecting the lifting of the lever S when the rod J is moved through cam N.

In Fig. 2 is shown the catch-lever with the cam s' thereon adjustable through screw S, passing through the slot indicated in dotted lines.

The operation maybe as follows: The parts are in the position they will occupy when the valve 7' is just about to open. Should the flywheel be turning at an excessive speed, the force of the cam N in moving slide N will cause the weight Pv of the governor to sag backward, compressing spring p and elevating arm O', so that it will pass over notch q on valve-rod J, thereby preventing the operation of valve j. After two, four, or other number of strokes, however, when the speed is reduced so that the governor may act to effeet the engagement of arm O' and rod J,which, as stated, is the condition shown in Fig. 1, the continued movement of slide N will etect the opening of valvej, thereby admitting gas to the cylinder C. Simultaneously the roller q', engaging cam s on lever S, eiects the release of rod K to close valve 7.3, this being about to occur. The piston in cylinder C then operates to draw gas into the cylinder and, as well, a certain proportion of air through valvel to form an explosive mixture. A means controlling the amount of air to be admitted may be employed, if desired. Vhen the piston moving into the cylinder compresses the explosive mixture and is about to move outward again, the explosion takes place. This may be by any suitable or well-known contrivance, such as we have illustrated at T, t being the usual chimney and t an auxiliary gas-supply for the igniting-jet. This device need not be further described. The explosion forces the piston outward, actuating the fly-wheel and increasing its speed slightly. At or before the return stroke immediately following cam R engages roller R to open valve 7c. At this time our device or catch operates to engage and hold open the valve 7c or exhaust, thereby on the succeeding strokes permitting a free movement of air or gas into and out from cylinder C, decreasing resistance to the movement of the piston, as before stated.

W'hat we claim as our invention isl. In a gas-engine, the combination with a' cylinder and a piston therein, of an exhaustvalve, means for exploding the gas behind the piston, said explosions taking place at intervals less frequent than one for every cycle of pistons movement, means for opening the exhaust behind said piston to exhaust the gas after sufficient explosion thereof, an inletvalve for the explosive mixture, a rod for operating said inlet-valve, an arm for engaging and moving said rod, a governor connected with said arm, a slide carrying the arm and governor and a cam for moving said slide, Substantially as herein shown and described.

2. In a gas-engine, the combination with a cylinder and a piston therein, of an exhaustvalve, means for exploding the gas behind the piston, said explosions taking place at intervals less frequent than one for every cycle of pistons movement, means for opening the exhaust behind said piston to exhaust the gas after sufiicient explosion thereof, an inletvalve for the explosive mixture, a rod to which said valve is attached, a pivoted arm, aslide carrying said latch and governor, a cam for actuating the slide,a rod carrying the exhaustvalve, a catch engaging said rod and means on the rod of the inlet-valve for operating said catch and a separate cam for operating the exhaust-valve, substantially as herein shown and described.

3. In a gas-engine, the combination with a cylinder and piston, of an exhaust-valve and an inlet-valve, two cams driven from the main shaft, means for actuating the inlet and exhaust valves by said cams, means for locking the exhaust-valve in open position, and means operated in connection with the inlet-valve for unlocking the exhaust-valve,substantially as herein shown and described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOSEPH BRAUTIGAM. PHILIPP IIOELZLEIN. Witnesses:

GEO. E. CRUsE, ALFRED II. EVANS.

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